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12th Chemistry Assignment 2021 with Answerkey (TNSCERT ) English Medium

12th Chemistry Assignment EM:- Hello Students recently Tamilnadu school department seek assignments from the school students, So we shared the assignment paper in pdf and we also provide an answer key for all subjects all class assignments in pdf

பனிரெண்டாம் வகுப்பு ஒப்படைப்பு 2021 உங்களுக்காக விடையுடன் கொடுக்க பட்டுள்ளது ,மிக நேர்த்தியாக வடிவமைக்க பட்ட இந்த விடை குறிப்புகளை நீங்கள் கீழே உள்ள PDF லிங்க்கை கிளிக் செய்வதன் மூலம் டவுன்லோட் செய்து கொள்ளலாம்

இந்த விடை குறிப்பில் உள்ள தவறுகளை சுட்டிக்காட்ட விரும்பினால் கேளே குறிப்பிடவும் ,உடனுக்குடன் தவறான விடையை மற்றயமைக்க படும்

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Aug 13, 2021

12th Standard - Assignment 1 - Answer Key - Chemistry - T/M

www.tnkalvi.net  shares you 12th  Standard - Assignment 1 - Answer Key - Chemistry ஒப்படவுக்கான விடைகள்  இங்கு Download செய்து படித்து பயன்பெறலாம் - which is Prepared by  

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     12th chemistry Assignment Worksheet english Medium 2021 was Prepared as per the New updated text book . We hope you that , This material is so useful for you so kindly share this material with your friends and make this material as a useful material for your friend too...

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Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Free Download is very important for students who want to score good marks in their CBSE board examination. Students who can Practice CBSE Class 12 Chemistry Multiple Choice Questions with Answers to improve your score in Board Exams.

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Chemistry Set 1 2021-2022 HSC Science (General) 12th Standard Board Exam Question Paper Solution

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General instructions :

The question paper is divided into four sections :

• Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each. Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
• Section B: Q. No. 3 to Q. No. 14 contain Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
• Section C: Q. No. 15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
• Section D: Q. No. 27 to Q. No. 31 contain Five long answer type of questions carrying Four marks each. (Attempt any Three).
• Use of the log table is allowed. Use of calculator is not allowed.
• Figures to the right indicate full marks.
• For each multiple-choice type of question, it is mandatory to write the correct answer along with its alphabet. e.g., (a)......../(b)......../(c)......./(d)........ No marks(s) shall be given if ONLY the correct answer or the alphabet of the correct answer is written. Only the first attempt will be considered for evaluation.

The coordination number of atoms in body-centred cubic structure (bcc) is ______.

Choose the most correct option.

In calculating osmotic pressure the concentration of solute is expressed in _______.

mole fraction

mass percent

The enthalpy change for the chemical reaction \[\ce{H2O_{(s)} -> H2O_{(l)}}\] is called enthalpy of ______.

vapourisation

sublimation

Which of the following transition element shows maximum oxidation state?

The correct formula for the complex compound, sodium hexacyanoferrate (III) is ______.

Na [Fe(CN) 6 ]

Na 2 [Fe(CN) 6 ]

Na 3 [Fe(CN) 6 ]

Na 4 [Fe(CN) 6 ]

[NaFe(CN) 6 ]

Isopropylbenzene on air oxidation followed by decomposition by dilute acid gives ______.

C 6 H 5 COOCH 3

C 6 H 5 COOH

C 6 H 5 CHO

The name of metal nanoparticle which acts as highly effective bacterial disinfectant in water purification process is ______.

carbon black

Acid anhydride on reaction with primary amine gives compound having a functional group ______.

secondary amine

The standard potential of the cell in the following reaction is ______.

\[\ce{Cd_{(s)} + Cu^{2+}_{(1M)} -> Cd^{2+}_{(1M)} + Cu_{(s)}}\]

`("E"_("Cd")^circ = - 0.403V, "E"_("Cu")^circ = 0.334V)`

– 0.737 V

– 0.069 V

The value of [H 3 O + ] in mol lit –1 of 0.001 M acetic acid solution (K a = 1.8 × 10 –5 ) is ______.

1.34 × 10 –1

1.34 × 10 –2

1.34 × 10 –3

1.34 × 10 –4

Write the product formed when alkyl halide reacts with silver nitrite.

Write the name of product formed, when acetone is treated with 2, 4-dinitrophenyl hydrazine.

Write the name of biodegradable polyamide copolymer.

Identify the molecularity of following elementary reaction:

NO (g) + O 3(g) → NO 3(g) + O (g)

What is the action of selenium on magnesium metal?

Write the name of isomerism in the following complexes:

[Cu(NH 3 ) 4 ] [PtCl 4 ] and [Pt(NH 3 ) 4 ] [ CuCl 4 ]

Write the name of the alloy used in the Fischer Tropsch process in the synthesis of gasoline.

Henry's law constant for CH 3 Br (g) is 0.159 mol dm –3 bar –1 at 25°C. What is the solubility of CH 3 Br (g) in water at the same temperature and partial pressure of 0.164 bar?

Explain pseudo first order reaction with a suitable example.

Write the consequences of Schottky defect with reasons.

What is the action of following on ethyl bromide:

Na in dry ether

Mg in dry ether

Explain formation of peptide linkage in protein with an example.

Derive an expression to calculate molar mass of non-volatile solute by osmotic pressure measurement.

Explain monodentate and ambidentate ligands with example.

Explain the trends in the following atomic properties of group 16 elements:

Atomic radii

Ionisation enthalpy

Electronegativity

Electron gain enthalpy

Write preparation of phenol from aniline.

Write chemical reactions to prepare ethanamine from:

Acetonitrile

Nitroethane

Identify A and B from the following reaction:

\[\begin{array}{cc} \ce{CH3}\phantom{.................}\\ |\phantom{....................}\\ \phantom{}\ce{2CH3 - C = O ->[Ba(OH)2] A ->[Δ] B + H2O} \end{array}\]

One mole of an ideal gas is expanded isothermally and reversibly from 10 L to 15 L at 300 K. Calculate the work done in the process.

How many moles of electrons are required for reduction of 2 moles of Zn 2+ to Zn? How many Faradays of electricity will be required?

Write chemical composition of haematite. Write the names and electronic configurations of first two elements of group 17.

Write classification of polymers on the basis of structure.

Define Green chemistry.

Write two disadvantages of nanotechnology.

Write a commercial method for preparation of glucose.

Write structure of adipic acid.

Write chemical reactions of following reagents on methoxyethane:

dilute H 2 SO 4

Explain cationic, anionic and neutral sphere complexes w ith example.

Calculate spin only magnetic moment of divalent cation of transition metal with atomic number 25.

Salts of Ti 4+ are colourless. Give reason.

What is lanthanoid contraction?

Write preparation of acetic acid from:

acetyl chloride

Write a classification of aliphatic ketones with a suitable example.

What is the action of sodium hypoiodite on acetone?

Define the half-life of a first-order reaction.

Obtain the expression for half-life and rate constant of the first-order reaction.

Calculate the standard enthalpy of formation of CH 3 OH (l) from the following data:

• \[\ce{CH3OH_{(l)} + 3/2 O2_{(g)} -> CO2_{(g)} + 2H2O_{(l)}ΔH^° = - 726 kJ mol^{-1}}\]
• \[\ce{C_{(s)} + O2_{(g)} → CO2_{(g)}Δ_cH^° = – 393 kJ mol^{-1}}\]
• \[\ce{H2_{(g)} + 1/2 O2_{(g)} -> H2O_{(l)}Δ_fH^° = - 286 kJ mol^{-1}}\]

Calculate the pH of buffer solution composed of 0.01 M weak base BOH and 0.02 M of its salt BA. [K b = 1.8 × 10 –5 for weak base]

Define the following term: isotonic solution

Explain the term osmosis.

Gold crystallises into face-centred cubic cells. The edge length of a unit cell is 4.08 × 10 –8 cm. Calculate the density of gold. [Molar mass of gold = 197 g mol –1 ]

Write the mathematical equation for the first law of thermodynamics for:

Isothermal process

Adiabatic process

Derive the relationship between pH and pOH.

Define Reference electrode

Answer the following in one or two sentences.

Write any two functions of salt bridge.

Draw a neat, labelled diagram of a standard hydrogen electrode (SHE).

Explain metal deficiency defect with examples.

Write the chemical equation for the preparation of sulphur dioxide from sulphur.

Write uses of sulphur.

Write chemical reactions for the following conversions:

Ethyl bromide to ethyl methyl ether.

Ethyl bromide to ethene.

Bromobenzene to toluene.

Chlorobenzene to biphenyl.

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Nios Chemistry 313 Solved Assignment 2021-22 for 12th Class

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Assignments For Class 12 Chemistry

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• Oakland University
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OUWB’s Afonso, Wasserman named Dean’s Distinguished Professors

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Two professors from Oakland University William Beaumont School of Medicine have each achieved the faculty rank of Dean’s Distinguished Professor. 

The Oakland University Board of Trustees approved the title changes recommended by Oakland University President Ora Hirsch Pescovitz, M.D., at its regular meeting on June 28, 2024.

Nelia Afonso, M.D., professor, and Jason Wasserman, Ph.D., professor — both from OUWB’s Department of Foundational Medical Studies — each received the title.

“This prestigious recognition is not merely a personal achievement but a testament to the collaborative efforts of our academic community,” said Afonso.

Wasserman shared similar thoughts.

“The thing that means the most to me is that it was the result of a nomination of at least 10 of my colleagues,” he said. “It’s a really nice honor.”

The rank of Dean’s Distinguished Professor was established in 2021 upon approval from the OU Provost and the OU Assistant Vice President of Academic Human Resources. It’s a permanent, honorific title that acknowledges contributions of employed, full-time, tenured faculty at the rank of professor.

According to the recommendations from Pescovitz, the designation “shall be afforded to awardees who have superior teaching skills that encompass the breadth and depth of their discipline, a distinguished record of public service, and scholarly, creative, and artistic achievements.”

‘Truly been a privilege’

Sarah Lerchenfeldt, Pharm.D., associate professor and interim co-chair, Department of Foundational Medical Studies, nominated Afonso.

In her nomination, Lerchenfeldt said Afonso “exemplifies the criteria” for the title.

“Since joining OUWB as a founding faculty member, she has demonstrated unparalleled dedication to medical education, significantly enhancing both the academic and practical aspects of these fields,” wrote Lerchenfeldt.

The nomination noted Afonso’s scholarly excellence, particularly in the domains of education, clinical skills, women’s health, and vaccine hesitancy. Lerchenfeldt said that Afonso was principal investigator for the Merck Investigator Studies program project called “Promoting Vaccine Confidence in Medical and Dental Students.” The project secured about $179,000 in funding.

The nomination also pointed to Afonso’s efforts to develop and refine the curriculum for OUWB’s Art and Practice of Medicine (APM) course, previous awards she received, commitment to service, and leadership roles with organizations like the Southeast Michigan Center for Medical Education.

“Dr. Afonso’s tenure at OUWB has been marked by a commitment to advancing medical education, research, and community health,” wrote Lerchenfeldt. “Her work not only reflects the values and mission of our institution, but also sets a benchmark for academic and professional excellence.”

Afonso said it has “truly been a privilege” to receive the title.

“I have been fortunate to be part of this medical school since its inception and I am grateful for the numerous opportunities provided that have fostered my growth as a physician, educator, and researcher,” she said. “I appreciate the dedication and commitment of our faculty and staff, whose support has been instrumental in implementing various curricular innovations.”

‘Invaluable member of OUWB faculty’  

Wasserman , who joined OUWB in 2013, was nominated by a group of 10 other faculty from the Department of Foundational Medical Studies.

They called him a “prolific and influential scholar” on several topics: homelessness, clinical bioethics, and Holocaust medicine.

“His scholarship and research range from core bioethics topics, such as autonomy and informed consent, to empirical research and qualitative inquiry into homelessness and medical ethics,” they wrote, and noted that he has published three books, 12 book chapters and supplements, 64 peer-reviewed journal articles, 22 editor-reviewed articles, and seven invited articles.

“Dr. Wasserman’s extensively cited research has contributed to important debates surrounding ethics in medical education, care for homeless individuals, pediatric ethical concerns, euthanasia, the rights of patients without decision-making capacity, and immunization policy,” wrote the nominators.

They also noted Wasserman’s roles in shaping the Medical Humanities and Clinical Bioethics (MHCB) curriculum, replacing traditional essay assignments with extemporaneous self-reflection videos, development of interactive iBooks, serving as a mentor to more than 50 OUWB students for their  Embark  projects, and developing a national training course in bioethics for the Arnold P. Gold Foundation.

The nominators also mentioned Wasserman’s history of service. In 2020, he was appointed as one of only two Provost Fellows for Faculty Diversity at Oakland University. In 2022, he was honored with the OU Founder’s Day Award for Faculty Excellence in Diversity, Equity, and Inclusion. He also chaired the admissions committee for five years, served as director of student professionalism for nine years, co-founded  Street Medicine Oakland , launched the Center for Moral Values in Health Medicine, and more.

And he has plans to do even more, including launching a new student-led journal on ethics, humanities, and social justice, and a health care ethics debate tournament that will be open to all OU students.  

“One of the reasons I came to OUWB was because it was a new school and there was a lot of opportunity to be entrepreneurial,” he said. “I didn’t want to go to some well-established place where the expectation is you teach your courses, you write papers, and otherwise just let things run.”

For more information, contact Andrew Dietderich, senior marketing specialist, OUWB, at [email protected] .

To request an interview, visit the OUWB Communications & Marketing  webpage .

This work is licensed under a  Creative Commons Attribution-NonCommercial 4.0 International License .

Chemical Communications

Modulation of fe–fe distance and spin in diiron complexes using tetradentate ligands with different flanking donors †.

* Corresponding authors

a The University of Iowa, Department of Chemistry, E331 Chemistry Building, Iowa City, IA 52242, USA E-mail: [email protected]

b The University of South Dakota, Department of Chemistry, 414 E Clark St., Vermillion SD, USA

c Michigan State University, Department of Chemistry, 578 South Shaw Lane, East Lansing, Michigan 48824, USA

d The Ohio State University, Department of Chemistry and Biochemistry, 100 West 18th Ave, Columbus, OH 43210, USA

Here we report the synthesis and characterization of diiron complexes containing triaryl N 4 and N 2 S 2 ligands derived from o -phenylenediamine. The complexes display significant differences in Fe–Fe distances and magnetic properties that depend on the identity of the flanking NMe 2 and SMe donor groups.

• This article is part of the themed collection: ChemComm 60th Anniversary Collection

Supplementary files

• Supplementary information PDF (2526K)
• Crystal structure data CIF (8076K)

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Modulation of Fe–Fe distance and spin in diiron complexes using tetradentate ligands with different flanking donors

K. D. Spielvogel, E. J. Campbell, S. R. Chowdhury, F. Benner, S. Demir, G. P. Hatzis, H. R. Petras, D. Sembukuttiarachchige, J. J. Shepherd, C. M. Thomas, B. Vlaisavljevich and S. R. Daly, Chem. Commun. , 2024, Advance Article , DOI: 10.1039/D4CC02522A

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12th Chemistry July Month assignment Answer key 2021 Tamil medium

பன்னிரண்டாம் வகுப்பு மாணவர்களுக்கான இரண்டாவது ஜூலை மாதத்திற்கான வினா விடை குறிப்புகள் இங்கே கொடுக்கப்பட்டுள்ளது உள்ள தகவலை உங்களுடைய நண்பர்களுக்கும் மறக்காமல் ஷேர் செய்யுங்கள்

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